Răspuns:
Explicație pas cu pas:
[8x(5xb+4)-2x(5xb+4)]:3=48
8x(bx5+4)-2x(bx5+4)=48x3
(8-2)(5xb+4)=144
6(5xb+4)=144
5xb+4=144:6
5xb+4=24
5xb=24-4
5xb=20
b=20:5
b=4
